638198981424 has 160 divisors (see below), whose sum is σ = 1869335354880. Its totient is φ = 208409760000.

The previous prime is 638198981393. The next prime is 638198981449. The reversal of 638198981424 is 424189891836.

638198981424 is a `hidden beast` number, since 6 + 38 + 1 + 98 + 98 + 1 + 424 = 666.

638198981424 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6566109 + ... + 6662595.

It is an arithmetic number, because the mean of its divisors is an integer number (11683345968).

Almost surely, 2^638198981424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638198981424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934667677440).

638198981424 is an abundant number, since it is smaller than the sum of its proper divisors (1231136373456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638198981424 is a wasteful number, since it uses less digits than its factorization.

638198981424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96816 (or 96804 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 63.

The spelling of 638198981424 in words is "six hundred thirty-eight billion, one hundred ninety-eight million, nine hundred eighty-one thousand, four hundred twenty-four".